Boiler-tube.



No. 658,39l. Patented Sept. 25, I900.

J. & A. NICLAUSSE.

BOILER TUBE.

(Application filed Mar. 13, 1900.)

(No Model.)

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A f NITED STATES PATENT OFFicE.

JULES NICLAUSSE AND ALBERT NIOLAUSSE, OF PARIS, FRANCE.

BOILER-TUBE.

SPECIFICATION forming part of Letters Patent no. 658391, dated September25, 19'00.

Application filed March 13, 1960. b'erial No. 8,438. (No model.)

To aZZ whom it may concern.-

Be it known that we, JULES NIOLAUSSE and ALBERT NICLAUSSE, citizens ofthe Republic of France, and residents of Paris, France,

have invented certain new and useful Improvements in Boiler-Tubes, ofwhich the fol lowing is a specification.

Our invention has relation to an improvement in boiler-tubes of the typedescribed and claimed in our Letters Patent No. 646,556, granted April3, 1900; and in such connection it relates more particularly to theconstruction and arrangement of such boilertubes.

The principal object of our present invention is tosimplify theconstruction and arrangement of the outer or vaporizing tube, the inneror circulation pipe, the conical joints or deformations on the outersurface of the vaporizing-tube, and the connection between the outer endof the vaporizing-tube and the circulation-tube in that general type ofboiler-tube as is illustrated in the patent hereinabove mentioned.

Our invention stated in general terms consists of a boiler-tubeconstructed and arranged in substantially the manner hereinafterdescribed and claimed.

The nature and scope of our invention will be more fully understood fromthe following description taken in connection with the accompanyingdrawings, forming part hereof, in which- Figure l is a longitudinalsectional View of the outer or vaporizing tube embodying main featuresof our invention. Fig. 2 is a similar view of the outer and inner tubes,showing the end plug carrying said inner tube or circulation-pipe; andFig. 3 is a verticalsectional view of a header, illustrating two tubesin place therein.

Referring to the drawings, A is the outer or vaporizing tube, having aninner cone 1) formed on its periphery by deformation or expansion of thewall of the tube. The outer end of the tube is thickened, as at a, toform the outer cone of the tube, and the interior of this thickened endis threaded to receive the screw plug or cap 0, adapted to close theouter end of said tube A. Within the tube A is located the circulationpipe or tube B,

. deforming the said wall.

which pipe or tube B is carried by the plug or cap 0 and readilyremovable therewith from the interior of the tube A.

The relationship of the two tubes A and B and the mode of operation isidentically the same as described in our prior patent, No. 6%,556; butin the present improvement the cone at the outer end of the tube A isformed by thickening the wall of the said tube A instead of, as in theprior patent, expanding or Again, in the pres ent improvement thethickening of the wall of the tube A at its outer end permits of theinterior of the tube at that point being threaded to receive the screwcap or plug 0, which carries the inner tube B. In our pre vious patentthe tube B was carried by a cap screwed to the exterior surface of thetube A beyond the conical expansion. Such a construction is bothcumbersome and comparatively defective, since in the expansion andcontraction of the tube A the weakened or threaded portion covered bythe cap is liable to break or leak. In our present construction the tubeA is strengthened at just the point where not only the joint with theheader 0 is made, but also where the cap or plug 0 is inserted.

Having thus described the nature and object of our invention, what weclaim as new, and desire to secure by Letters Patent, is

In a boiler-tube, an outer or vaporizing tube having a portion of itswall expanded to form a conical deformation and having its outer endthickened to form a second conical deformation, the interior of saidthickened end being threaded, in combination with an inner circulation-tube and a cap or plug carrying said inner tube and adapted to bescrewed into the threaded thickened end of the vaporizing-tube,substantially as and for the purposes described.

In testimony whereof we have signed this specification in the presenceof two subscribing witnesses.

JULES NICLAUSSE. ALBERT NIOLAUSSE.

Witnesses: EDWARD P. MACLEAN, C. DE MESTO.

